Issue of simulation with a delay of transport subsystem

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• problems with the implementation of MPC with system delays

  Hello

  I have Aproblem to implement a MPC controller for a system with significant delays. The final control system will be used with a RT PXI on an engine test bench, but for now, I'm running a few previous simulations to solve problems.

  The attached vi shows a simplified system for MIMO 2 x 2. When I run it with the default settings (initial window = 0; = 5 prediction horizon and horizon of control = 2; no delay of system, or delay of prediction model) everything works fine.

  However, if I understand a delay of the plant (time factory example = 10) the CPC shows a behaviour that is not clear to me:

  * If I put 'integral action?' false: MPC operates in open loop, and the MPC calculates (and apply) the same control in the system not delayed action. Of course, it cannot compensate for errors in modeling, is not really for me.

  * If I put 'integral action?' to true: System is not stable. for fixing it, I change the initial window at 10 (and therefore the forecast at 15 horizon). Although the system is now stable, the performance of the control is not really good, because significant overruns exist

  Then I try to include in my prediction model of the delay (through a block 'CD Set delays to the (State-Space) model'), but it seems that the PPC is not sensitive about the time defined in the model.

  Hepatitis could me?

  Thank you very much in advance,

  Carlos (Adama)

  (Note, in the attached example, in what I scored blue settings that I'm changing)

  Don't worry, I solved the problem myself including delays in the model defining additional States that aceted as souvenirs.

  I can confirm that the CPC does not takes into account the deadlines defined in the model of the SS.

• Mac crashes with some delay

  MacBook Air (13 inches, beginning 2014) 1.4 GHz intel core i5 4 GB 1600 MHz DDR3Intel HD Graphics 5000 1536 MB

  Downloaded constant guard by Xfinity Norton. All scanned and no virus found. Files, quick scan, system, absolutely nothing. This is the question that I had. My Mac would freeze upwards on the websites with a delay when you try to scroll to the bottom of the page. Go looking for something and it would be a delay in typing. I was let her rest ok and stopping. Well not every night. I was not closing things by like mail or safari or finder. Could be the problem? I mean that there are no viruses! Should I do turn to norton or keep? Thanks for the information and I hope this can be a quick fix.

  First, never use any type of software "anti-virus" or "anti-malware" on a Mac. That's how cause you problems, not how you solve them.

  When you find the problem, note the exact time: hour, minute, second.

  These must be run as administrator. If you have only one user account, you are the administrator.

  Run the Console application in one of the following ways:

  ☞ Enter the first letters of his name in a Spotlight search. Select from the results (it should be at the top).

  ☞ In the Finder, select go utilities ▹ of menu bar or press the combination of keys shift-command-U. The application is in the folder that opens.

  ☞ Open LaunchPad and start typing the name.

  The title of the Console window should be all Messages. If it isn't, select

  SYSTEM LOG QUERIES ▹ all Messages

  in the list of logs on the left. If you don't see this list, select

  List of newspapers seen ▹ display

  in the menu at the top of the screen bar.

  Each message in the journal begins with the date and time when it was entered. Highlight date back to the time you noted above.

  Select the messages entered since then until the end of the episode, or until they begin to repeat, whichever comes first.

  Copy messages to the Clipboard by pressing Control-C key combination. Paste into a reply to this message by pressing command + V.

  The journal contains a large amount of information, almost all this is useless to solve any particular problem. When you post a journal excerpt, be selective. A few dozen lines are almost always more than enough.

  Please don't dump blindly thousands of lines in the journal in this discussion.

  Please do not post screenshots of log messages - text poster.

  Some private information, such as your name, may appear in the log. Anonymize before posting.

  When you post the journal excerpt, an error message may appear on the web page: "you include content in your post that is not allowed", or "the message contains invalid characters." It's a bug in the forum software. Thanks for posting the text on Pastebin, then post here a link to the page you created.

  If you have an account on Pastebin, please do not select private in exposure menu to paste on the page, because no one else that you will be able to see it.

• PID control with big delay in the process variable

  Hello

  My goal is to control the temperature via a valve and heat exchanger. I proceeded variable (temperature) measured from a hose. This temperature should be raised a few degrees with a heat exchanger. So basically I need to order a valve that allows the water to flow through the heat exchanger to raise the temperature to the desired level.

  My original plan was to use a base PID regulation to operate the dispenser. However, it is about 0.5 to 1 minute of delay time in the temperature probe after I opened the valve, which increases the temperature. This leads to a situation where the PID regulation valve fully open during this period (trying to get the temperature rise). Then once the temperature begins to rise it fires quite quickly. PID begins turning the tap off almost immediately, but because of the time delay in the sensor, the temperature exceeds seriously. This led to severe oscillation and at worst unstable processes. I tried to adjust the PID control to "predict" the timer to close the valve in advance to minimize the excess, but failed.

  I would appreciate if anyone has any ideas how to make this type of control with Labview PID functions. I also wonder if there is a better type of control procedure for this scenario as a PID control?

  -Lars

  This is a very common situation in the heating control, and generally PID can be adjusted to make it work. How do you do the tuning? If you do it by trial and errors, you have little chance to succeed. For a slow process with time delay, I like to use the method Cohen Coons, or similar open Ziegler-Nichols-loop method. The idea is that you temporarily remove or disable the PID. Set the valve in a fixed position and wait for the temperature to stabilize. Then, change the setting of the valve and record temperature at regular intervals data until the temperature is stable again to a new value. Use these data to get the initial values of PID using the equations provided by the tuning method you choose.

• screenshot of my Simulator with my running app

  How to take a screenshot of my Simulator with my application running on it.

  Reason, I need to screen shot of my application, but don't want to recreate and resize everything on photoshop just for a screenshot. Any help would be thank you very much.

  If you are on Windows, press print screen on the keyboard, start MSPaint and paste the image into Paint... You can crop then just to the Simulator window = should be pixel-to-pixel because simulator is not resizable. I hope this helps.

• protection tunnels works with the mode of transport only?

  Anyone know why protection tunnel works with the mode of transport only? If I change to tunnel mode, it stops working immediately.

  Thank you

  That's because Tunnel mode creates a new IP header that is modified when is coordinated, when the remote peer receives this new header which is concerned the Security numbers do not match what it generated. Using transport mode retains the original header and only encapsulates the payload.

• Socket connection in the Simulator with MDS, but not on the curve

  Hello

  Working on an application using socket connections.

  SOC = (SocketConnectionEnhanced) Connector.open ("socket: / /" + address.ip_number + ":" + address.port_number + ";") deviceside = true");

  Proceed to use a DataInputStream and DataOutputStream to communicate.

  The server works, can transmit very well with the Simulator, but also another curve (not same model). (There is a small chance that deviceside = true has not been passed as a parameter when we tested on the curve, which would go through BES? This is probably still there however).

  IMHO, this means the places that the question could be one) how the code is implemented on the client phone or b) phones or their settings (have 4 curve 8530 s on the same CDMA network).

  -These phones have already activated in the last days, is there the chances that something is missing from the service book to allow socket connections? (I doubt that what I downloaded messenger ping I assume uses taken... and everything is fine).

  No authorization application that I put?

  Ideas! Please let your mind flow. Thank you!

  To all those who might find this thread after encountering the same problem:

  The issue was with the DataInputStream... available() was ALWAYS return zero, even if there are more bytes to read. This is our 8530 s curve 4 tests phones. Tried on another curve and "BOLD" and they did not have this problem.

  Use available() stopped and tried reading for much bigger than one of our packages will be (5000 bytes).

  Have some phones to test with 5.0.0.337 that they would not work with that.

  After the 5.0.0.1000 they all work perfectly.

  I read somewhere that the available() issue has to do with J2SE-> J2ME problems, something on a wrapper. This problem exists (or existed) with TSL/SSL apparently (sorry I can't find the thread I get this info, if someone really wants to see him answer and I'll get the link in the history of my browser of laptops).

  Hope this helps someone!

  B

• Problem launching iOS Simulator with AIR 15.0.0.274

  I'm not having any luck debugging my AIR 15.0.0.274 pure ActionScript project with iOS Simulator included with Xcode 6.0.1 (OS X 10.9.5).) No iOS work debugging Simulator for someone else with this combination of FLIGHT and Xcode?

  The packing process-error with the following message:

  Uninstall the Application from the iOS Simulator

  Unknown or not supported SDK version:

  /Applications/XCode.app/Contents/developer/platforms/iPhoneSimulator.platform/developer/SD Ks/iPhoneSimulator.sdk

  Hi Grahamsmith,

  We checked the issue at our end, things work correctly.

  Could you please use following command to package and install app on Simulator.

  App package:

  ADT-package - target the ipa-test-interpreter-Simulator - shops - keystore < certificates=""> -storepass < password=""> <.ipa> <.xml> platformsdk - /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/S DKs/iPhoneSimulator8.0.sdk/

  Install App:

  ADT - installApp-ios - platformsdk /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/S Dks/iphonesimulator8.0.sdk-peripherique ios-Simulator-package platform< ipa="">

  Launch the application:

  ADT - ios - platformsdk /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/S Dks/iphonesimulator8.0.sdk-peripherique ios-Simulator - appid launchApp-platform

  Thank you

  Jitender

     

• Not simulated with MyRIO not showing MAX devices

  I'm trying to teach my children that I made using LabView and MyRIO. I use the LabView2013 provided with the MyRIO. I wanted to create some signals to test our VI using a simulated device created in MAX. However, when I go in MAX and right-click devices and interfaces and select create new , there is no option simulated NEITHER-DAQmx device or modular Instrument . What I am doing wrong? Thank you.

  

  I'm guessing that you don't have the DAQmx driver installed, which gives you the ability to simulate these devices.

• (I hope) Simple problem with time delay

  Hey people,

  I am a neophyte of labview and I have a program (see table) on the screen I use to Flash one of the three signs a pressure switch is released. There is a detection device of time between the pressure switch (run through a data acquisition) and the flashing of the sign on the screen; However, when I use a nonzero value for the delay, the acquisition of data appears to trigger after a variable duration after the button is released, and THEN the delay occurs. If I don't use any delay, acquiring data reliable triggers immediately after the switch is released (and therefore the sign flashes immediately as well).

  I can't understand why the DAQ does not trigger immediately in all cases, regardless of the value of the elapsed time. The only thing I can think of that could have an impact on is the computer I do turn it through is dated (2 Ghz P4 with 512 MB of RAM), but it's not as if it is a program that is complicated... Please help! Thank you!

  The stacked sequence right click and "replace with flat sequence. The flat sequence right click and 'delete the sequence '.

  You have a race condition between val Trig and local of it. Wire directly to the loop to make sure that it is this happening val trig that you use and not the previous races.

  /Y

• Display in real time with a delayed recording LV6.1

  Hi, I need help with LabView 6.1

  I have a hardware module FieldPoint where I read 8 channels for thermocouple. I want to display the value of the thermocouples in real time (or as close as I can manage) all saving the values in a CSV file at discrete time intervals (every 10 seconds). I am able to display the values in real-time, but the recorder real-time records, produce a lot too much data. I'm able to delay the recording interval, but in bulk then display in real time!

  The following example shows a method I've tried. The delay time in the loop of logging seems to delay the entire program. I also tried to use the loop of the logging of a sequence (using a simple delay of 'Wait') structure and a structure of matter (with a counter and only do the loop of logging real when the counter gets to 1). I tried to configure synchronous display without success.

  I'm having no luck and wonder if someone could point me in the right direction?

  Ah, the benefits of time.

  I think that I managed to create a solution for me using a different tact. Instead of using individual meters of delay, I used a "trigger time" approach as demonstrated in this thread;

  http://forums.NI.com/NI/board/message?board.ID=170&message.ID=286988&query.ID=6280650#M286988

  Currently, it is limited because it will allow only a delay of 59 seconds between the readings, but this should be relatively easy to solve. The solution works continuously update the display with a slight delay to help cope aging computers, and then the button "Log Data" is selected writing worksheet function is called second pushed together as selected. Quite a simple and elegant solution I think.

• Flight Simulator with Acceleration Expansion Pack will not charge.

  I got to many (over 75) hours of enjoyment with Flight Simulator after that that it was loaded.  I am also under Just Flight expansion 'Cargo Pilot' with FSX and also have seamless integration with this product until Thursday.  I stole a flight from Indianapolis to Norfolk, and once the plane landed as always by Cargo pilot tried to close the Flight Simulator.  The game is not responding and crashed.  After 25 minutes, I rebooted my system.  Even now, I can't Flight Simulator to open it.  I load the title area and start thinking like it wants to load the program but nothing happens.

  I want to record the reinstall to be a last resort full that I performed many missions in FS and I don't want to lose my flight log or a history of flight.

  Can I do short of uninstalling and reinstalling?

  Thank you!

  Hello

  Welcome to the Microsoft Answers site!

  Check in Windows Update if updates took place before the game crashed?

  To resolve this problem, you can try renaming the file Logbook.bin. To do this, follow these steps:

  1. click on Start.

  2. click on My Documents or Documents.

  3. double-click on the file folder of Microsoft Flight Simulator X to open it.

  4. right click on the Logbook.bin file and then click Rename.

  5. rename the Logbook.OLD and then press ENTER.

  6 start Flight Simulator X to create a new log file.

  Hope this information is useful.

  Amrita M

  Microsoft Answers Support Engineer
  Visit our Microsoft answers feedback Forum and let us know what you think.

• A message with a delay

  I want to display a message like after every one hour. I thought to use while loop with delay. But I don't want a delay when the message appears for the first time. I want a time gap essentially before the message appears again.

  Use one another while loop with a structure of the event. Put timeout in a registry to offset initialized to zero (so it immediately triggers the event timeout) and connect to Terminal timeout. On the right, thread 1 hour (in ms) to the shift register. Now, it will take an hour for the timeout to occur next.

  (Also add an event to the button stop to this parallel loop will terminate if the program is stopped.)

• Configuration of the Simulator with Eclipse

  HI -.

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  Amod

  To view the documentation on that, click on the Help menu of Eclipse and choose summary help.  Then expand 'BlackBerry JDE plug-in for Eclipse Guide', expand 'Configuring the BlackBerry Smartphone Simulator' and then click 'Specify a BlackBerry Smartphone Simulator for a specific type of BlackBerry smartphone'.

• Internet Simulator with mds on does not work

  Hi all, I'm having a problem using the Simulator.

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  Maybe your Mobile network is disabled, go to connection to manage in your Simulator and check it out.